CEF Off-Screen rendering

[MrNobody]

Hello, I've tried to implement off-screen rendering as part of a game. CEF seems to start without any problems, but OnPaint event is not ever triggered.
I tried to load some test websites in code like so, but nothing happens:

Code: Select all

renderHandler = new RenderHandler(zrenderer, 256, 256);

{
   CefBrowserSettings browserSettings;
   browserSettings.windowless_frame_rate = 20; // 30 is default

   CefWindowInfo window_info;
   window_info.SetAsWindowless(nullptr);

   browserClient = new BrowserClient(renderHandler);
   browser = CefBrowserHost::CreateBrowserSync(window_info, browserClient.get(), "https://imgur.com/", browserSettings, nullptr, nullptr);
}

And here is debug.log:

Code: Select all

[0831/003844.363:INFO:content_main_runner_impl.cc(993)] Chrome is running in full browser mode.
[0831/003847.668:WARNING:gpu_process_host.cc(1256)] The GPU process has crashed 1 time(s)
[0831/003850.704:WARNING:gpu_process_host.cc(1256)] The GPU process has crashed 2 time(s)
[0831/003853.942:WARNING:gpu_process_host.cc(1256)] The GPU process has crashed 3 time(s)
[0831/003857.691:WARNING:gpu_process_host.cc(1256)] The GPU process has crashed 4 time(s)
[0831/003857.891:ERROR:network_service_instance_impl.cc(264)] Network service crashed, restarting service.
[0831/003900.818:WARNING:gpu_process_host.cc(1256)] The GPU process has crashed 5 time(s)
[0831/003902.354:ERROR:network_service_instance_impl.cc(264)] Network service crashed, restarting service.
[0831/003903.973:WARNING:gpu_process_host.cc(1256)] The GPU process has crashed 6 time(s)
[0831/003903.973:ERROR:gpu_process_host.cc(525)] !GpuDataManagerImpl::GpuProcessStartAllowed()
[0831/003903.974:ERROR:gpu_process_host.cc(525)] !GpuDataManagerImpl::GpuProcessStartAllowed()
[0831/003903.974:ERROR:browser_gpu_channel_host_factory.cc(167)] Failed to launch GPU process.
[0831/003905.504:ERROR:network_service_instance_impl.cc(264)] Network service crashed, restarting service.
[0831/003908.427:ERROR:network_service_instance_impl.cc(264)] Network service crashed, restarting service.
[0831/003911.547:ERROR:network_service_instance_impl.cc(264)] Network service crashed, restarting service.
[0831/003914.757:ERROR:network_service_instance_impl.cc(264)] Network service crashed, restarting service.
[0831/003917.776:ERROR:network_service_instance_impl.cc(264)] Network service crashed, restarting service.
[0831/003920.842:ERROR:network_service_instance_impl.cc(264)] Network service crashed, restarting service.
[0831/003923.906:ERROR:network_service_instance_impl.cc(264)] Network service crashed, restarting service.
[0831/003926.930:ERROR:network_service_instance_impl.cc(264)] Network service crashed, restarting service.
[0831/003930.083:ERROR:network_service_instance_impl.cc(264)] Network service crashed, restarting service.
[0831/003933.180:ERROR:network_service_instance_impl.cc(264)] Network service crashed, restarting service.
[0831/003936.324:ERROR:network_service_instance_impl.cc(264)] Network service crashed, restarting service.
[0831/003939.399:ERROR:network_service_instance_impl.cc(264)] Network service crashed, restarting service.
[0831/003942.494:ERROR:network_service_instance_impl.cc(264)] Network service crashed, restarting service.
[0831/003945.593:ERROR:network_service_instance_impl.cc(264)] Network service crashed, restarting service.
[0831/003948.688:ERROR:network_service_instance_impl.cc(264)] Network service crashed, restarting service.
[0831/003951.772:ERROR:network_service_instance_impl.cc(264)] Network service crashed, restarting service.
[0831/003954.792:ERROR:network_service_instance_impl.cc(264)] Network service crashed, restarting service.
[0831/003957.915:ERROR:network_service_instance_impl.cc(264)] Network service crashed, restarting service.
[0831/004001.029:ERROR:network_service_instance_impl.cc(264)] Network service crashed, restarting service.
[0831/004004.161:ERROR:network_service_instance_impl.cc(264)] Network service crashed, restarting service.
[0831/004007.261:ERROR:network_service_instance_impl.cc(264)] Network service crashed, restarting service.
[0831/004010.379:ERROR:network_service_instance_impl.cc(264)] Network service crashed, restarting service.
[0831/004013.627:ERROR:network_service_instance_impl.cc(264)] Network service crashed, restarting service.
[0831/004016.799:ERROR:network_service_instance_impl.cc(264)] Network service crashed, restarting service.
[0831/004019.967:ERROR:network_service_instance_impl.cc(264)] Network service crashed, restarting service.
[0831/004023.106:ERROR:network_service_instance_impl.cc(264)] Network service crashed, restarting service.
[0831/004026.198:ERROR:network_service_instance_impl.cc(264)] Network service crashed, restarting service.
[0831/004029.351:ERROR:network_service_instance_impl.cc(264)] Network service crashed, restarting service.
[0831/004032.422:ERROR:network_service_instance_impl.cc(264)] Network service crashed, restarting service.
[0831/004035.479:ERROR:network_service_instance_impl.cc(264)] Network service crashed, restarting service.
[0831/004038.513:ERROR:network_service_instance_impl.cc(264)] Network service crashed, restarting service.
[0831/004041.623:ERROR:network_service_instance_impl.cc(264)] Network service crashed, restarting service.
[0831/004044.675:ERROR:network_service_instance_impl.cc(264)] Network service crashed, restarting service.
[0831/004047.940:ERROR:network_service_instance_impl.cc(264)] Network service crashed, restarting service.
[0831/004051.251:ERROR:network_service_instance_impl.cc(264)] Network service crashed, restarting service.
[0831/004054.400:ERROR:network_service_instance_impl.cc(264)] Network service crashed, restarting service.
[0831/004057.521:ERROR:network_service_instance_impl.cc(264)] Network service crashed, restarting service.
[0831/004100.683:ERROR:network_service_instance_impl.cc(264)] Network service crashed, restarting service.
[0831/004103.780:ERROR:network_service_instance_impl.cc(264)] Network service crashed, restarting service.
[0831/004106.830:ERROR:network_service_instance_impl.cc(264)] Network service crashed, restarting service.
[0831/004109.863:ERROR:network_service_instance_impl.cc(264)] Network service crashed, restarting service.
[0831/004110.727:FATAL:shutdown_checker.cc(52)] Check failed: !IsCefShutdown(). Object reference incorrectly held at CefShutdown


As far as I understand something is wrong with network device and gpu process.
Does anyone know how to resolve this issue?

Thanks in advance,
MrNobody

[magreenblatt]

How are you running sub-processes? See https://bitbucket.org/chromiumembedded/ ... -structure

[MrNobody]

Thanks. Looks like I misunderstood how CEF works. In the evening I will try to fix the problem.

[uwekeim]

Thanks. Looks like I misunderstood how CEF works. In the evening I will try to fix the problem.

Did you ever succeed in solving this?

Because right now I'm having the same issue and the link to https://bitbucket.org/chromiumembedded/ ... -structure did not help me in making it clearer how to solve.

[uwekeim]

I successfully tried this one:

viewtopic.php?f=17&t=17757

I.e. after not setting the BrowserSubprocessPath (in CefSharp), the error went away.

But I really do like to understand why the non-headless CEF works when setting the BrowserSubprocessPath, whereas the headless CEF does not work.